/*

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     licenses@blazegraph.com

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
/*
 * Created on Jun 19, 2008
 */

package com.bigdata.relation.rule;

import java.io.Serializable;

import com.bigdata.bop.IConstant;
import com.bigdata.bop.IVariable;

/**
 * Interface for a binding.
 * 
 * @author <a href="mailto:mrpersonick@users.sourceforge.net">Mike Personick</a>
 */
public interface IBinding extends Cloneable, Serializable {

    /**
     * Get the variable.
     * 
     * @return the variable
     */
    IVariable getVar();
    
    /**
     * Get the value.
     * 
     * @return the value
     */
    IConstant getVal();
    
    /**
     * True iff the variable and its bound value is the same
     * for the two bindings.
     * 
     * @param o
     *            Another binding.
     */
    boolean equals(IBinding o);
    
}
